linux-kernel - Re: [PATCH V5 03/11] coresight: tmc: Extract device properties from AMBA pid based table lookup

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Message-ID: <4bfe9477-9ea9-4609-96c8-470cd5393d75@arm.com>
Date: Wed, 6 Mar 2024 09:24:53 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
 linux-arm-kernel@...ts.infradead.org
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Sudeep Holla <sudeep.holla@....com>, Mike Leach <mike.leach@...aro.org>,
 James Clark <james.clark@....com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>, linux-acpi@...r.kernel.org,
 linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
 linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V5 03/11] coresight: tmc: Extract device properties from
 AMBA pid based table lookup



On 3/5/24 20:06, Suzuki K Poulose wrote:
> On 22/02/2024 08:21, Anshuman Khandual wrote:
>> This extracts device properties from AMBA pid based table lookup. But first
>> this modifies tmc_etr_setup_caps() to accept csdev access.
>>
>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>> Cc: Mike Leach <mike.leach@...aro.org>
>> Cc: James Clark <james.clark@....com>
>> Cc: coresight@...ts.linaro.org
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-kernel@...r.kernel.org
>> Reviewed-by: James Clark <james.clark@....com>
> 
> minor nit: Since there were significant changes from what James previously reviewed, it is a good idea to drop his Reviewed-by:

Sure, will do.

> 
> Otherwise, the changes look good to me.
> 
> Suzuki
> 
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>> Changes in V5:
>>
>> - Modified tmc_etr_setup_caps() to accept struct csdev_access argument
>> - Reverted back tmc_etr_setup_caps() call site position in tmc_probe()
>> - Dropped custom mask TMC_AMBA_MASK
>>
>>   drivers/hwtracing/coresight/coresight-tmc-core.c | 14 ++++++++++----
>>   1 file changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
>> index 7ec5365e2b64..43874fa4def0 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
>> @@ -370,16 +370,23 @@ static inline bool tmc_etr_has_non_secure_access(struct tmc_drvdata *drvdata)
>>       return (auth & TMC_AUTH_NSID_MASK) == 0x3;
>>   }
>>   +static const struct amba_id tmc_ids[];
>> +
>>   /* Detect and initialise the capabilities of a TMC ETR */
>> -static int tmc_etr_setup_caps(struct device *parent, u32 devid, void *dev_caps)
>> +static int tmc_etr_setup_caps(struct device *parent, u32 devid,
>> +                  struct csdev_access *access)
>>   {
>>       int rc;
>> -    u32 dma_mask = 0;
>> +    u32 tmc_pid, dma_mask = 0;
>>       struct tmc_drvdata *drvdata = dev_get_drvdata(parent);
>> +    void *dev_caps;
>>         if (!tmc_etr_has_non_secure_access(drvdata))
>>           return -EACCES;
>>   +    tmc_pid = coresight_get_pid(access);
>> +    dev_caps = coresight_get_uci_data_from_amba(tmc_ids, tmc_pid);
>> +
>>       /* Set the unadvertised capabilities */
>>       tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
>>   @@ -497,8 +504,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>>           desc.type = CORESIGHT_DEV_TYPE_SINK;
>>           desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM;
>>           desc.ops = &tmc_etr_cs_ops;
>> -        ret = tmc_etr_setup_caps(dev, devid,
>> -                     coresight_get_uci_data(id));
>> +        ret = tmc_etr_setup_caps(dev, devid, &desc.access);
>>           if (ret)
>>               goto out;
>>           idr_init(&drvdata->idr);
>